Optical and electron spin resonance studies of xenon-nitrogen-helium condensates containing nitrogen and oxygen atoms.
Optical and electron spin resonance studies of xenon-nitrogen-helium condensates containing nitrogen and oxygen atoms.
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含有氮和氧原子的氙-氮-氦凝聚物的光学和电子自旋共振研究。
DOI：
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发表时间：
2015
影响因子：
2.9
通讯作者：
David M. Lee
中科院分区：
文献类型：
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作者：
R. Boltnev;I. B. Bykhalo;I. N. Krushinskaya;A. Pelmenev;V. Khmelenko;S. Mao;A. Meraki;S. Wilde;P. Mccolgan;David M. Lee
我们提出的第一个观察准分子XeO* 分子在分子氮薄膜周围的氙核心的纳米团簇。多壳层纳米团簇的形式后，快速冷却的氦射流含有少量的混合物的氮和氙的冷氦蒸汽（T = 1.5 K）。这种纳米团簇注入超流氦聚集成多孔杂质氦冷凝物。氦气与混合物通过射频放电允许存储高密度的自由基稳定在杂质氦冷凝物。在这种凝聚物的破坏过程中，自由基发生强烈的复合，并产生由于光发射而可观察到的激发态物质。氙-氮-氦凝聚体破坏后，探测到丰富的氙-氧复合物光谱。氙环境使亚稳态N（2）D原子猝灭，但对N（2）P原子发光的影响要弱得多。本文研究了氙-氮-氦凝聚体中N（4）S原子的电子自旋共振谱。氙-氮纳米团簇中稳定的氮原子的局部浓度高（高达10（21）cm（-3））。
We present the first observations of excimer XeO* molecules in molecular nitrogen films surrounding xenon cores of nanoclusters. Multishell nanoclusters form upon the fast cooling of a helium jet containing small admixtures of nitrogen and xenon by cold helium vapor (T = 1.5 K). Such nanoclusters injected into superfluid helium aggregate into porous impurity-helium condensates. Passage of helium gas with admixtures through a radio frequency discharge allows the storage of high densities of radicals stabilized in impurity-helium condensates. Intense recombination of the radicals occurs during destruction of such condensates and generates excited species observable because of optical emission. Rich spectra of xenon-oxygen complexes have been detected upon destruction of xenon-nitrogen-helium condensates. A xenon environment quenches metastable N((2)D) atoms but has a much weaker effect on the luminescence of N((2)P) atoms. Electron spin resonance spectra of N((4)S) atoms trapped in xenon-nitrogen-helium condensates have been studied. High local concentrations of nitrogen atoms (up to 10(21) cm(-3)) stabilized in xenon-nitrogen nanoclusters have been revealed.